Driving-band.



PATENTED FEB. 10, 1903.

G. FOUILLARON.

DRIVING BAND. APPLIOAI'ION FILED 001'. so; 1901.

N0 MODEL.

UNITE STATES 1 PATENT OFFICE.

GUSTAVE FOUILLARON, OF Cl-IQLET, FRANOF.

DRIVING-BAND.

SPECIFICATION forming part of Letters Patent No. 720,340, dated February10, 1903.

Application filed October 30,1901. Serial No. 80,516- (No model.)

To all whom it may concern:

Be it known that I, GUs'TAvE FOUILLARON, a citizen of the RepublicofFrance, and a resident of Oholet, Maine-et-Loire, France, haveinvented a new and useful Improvement in Driving-Bands, of which thefollowing is a specification. 1

This invention relates more especially to driving-bands intended for thechanging of speed by extensible pulleys formed bytwo conical elementshaving their apexes opposite to each other and capable of being spreadapart or brought together, leaving between them a groove in the form ofa V of variable diameter. Such a belt should, above all, be veryflexible if it be desired to operate without slipping and without lossby friction; otherwise it would not be capable of adapting itselfexactly to the V-shaped groove. It should, moreover, be very resistant,for the reason that on such pulleys, their movable parts being submittedto the action of springs, it is always very tense.

In the accompanying drawings, Figures 1 and 2 show in side View and inplan part of the band, and Figs. 3 and 4 are sections on the line A B ofFigs. 1 and 2 looking in the direction of the arrows 14 and 15. Fig. 5is a section on the line C D of Fig. 1, and Fig. 6 is a perspectiveviewof one of the elements of the band.

The band consists of elementary parts 160 of triangular cross-section,each consisting of several thicknesses of leather side by side and gluedtogether. The thickness of each of said elementary parts decreasestoward the apex, which has to bear on the bottom of the gap between theconesthat is to say, the bottom of the groove of the pulley-so that theadjoining elements can incline easily toward each other to take a radialposition on the pulleys. The elements are connected by catgut cords151,which pass through holes 161, pierced for this purpose in theelements. In order to-obtain the desired supplenessthat is to say, inorder that the catgut cords may bend easily between the elements-theouter layers of leather are notched or recessed to give free passage forthe cords, which have only to pass through holes in the inner layers159. Thus between two adjacent elements I there is a free length of eachcord sufficient twisted, so as to form a kind of cable-strand,

and owing to this twist the elements remain at the original'distanceapart, as they cannot separate farther nor approach so as to touch eachother under the influence of the traction to which they are subjectedwhile the band is at work.

In manufacturing the band I proceed as follows: I take six catgut cords,three for each strand. I fold each in two at the middle and pass thetwelve threads thus obtained through the twelve holes of a metal plate162, preferably of aluminium. by its middle or folded part comingagainst one of the faces of the plate, and I then string on the twelvecords the successive elements 160, taking care to pass the several cordsthrough the holes which suit the desired twist. When a number ofelements isstrung on sufificient to give the desired length of band, Ipass the projecting ends of the cords through the holes of anotherplate, 163, and stop the projecting ends in any suitable way. Forinstance, they may be immersed in hot wax, which swells the catgut; orthe same result may be attained by winding yarn around the projectingends, then coating with-resin and heating. In order to connect the endsof the band, I employ two stirrups 164, the branches of which I passbehind the two plates 162 163, and I connect the free ends of thebranches by yoke-plates 165, through which they pass and are secured bynuts 166.

Although I prefer catgut cords to connect the elements, I may obviouslyemploy cords of other material or wires.

As shown by Fig. 5, besides the holes for passage of the cords theelements have supplementary holes 172, so as to lighten the band.

In order to prevent torsion of the belt upon Each cord is stoppeditself, the twisting of one of its strands may be made in one directionand that of the other in the opposite direction.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A driving-band of triangularsection constitu ted by elementary partsof leather placed side by side and connected by flexible cords passingthrough holes in them in such manner as to be twisted into strands.

2. A driving-band comprising elements of triangular general form each ofmany thicknesses of leather placed side by side and united by adhesivematerial and which pass through holes in said elements in such manner asto be twisted, the exterior thicknesses of leather of said elementsbeing recessed in such manner that the cords only pass through themiddle thicknesses and in such manner that the length of the elementsdecreases to- Ward the apex of the triangle which comes toward thebottoms of the grooves of the pulleys to which the belt is applied.

3. A driving-band comprising a perforated metallic plate 162, cordsdoubled in such manner as to form two threads threaded through holes insaid plate in such manner that the cords are stopped by said plate attheir folded part, perforated elements 160 of triangular form threadedupon said threads in such manner that the latter are twisted intostrands, a metallic plate 163 through holes in which pass the freeextremities of said threads, means for preventing these passingextremities from repassing through said plate 163, and stirrups 164passing behind said plates 162, 163 and maintained in place byyoke-plates 165 and nuts 166, all substantially as herein described.

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two witnesses,this 18th day of October, 1901.

GUSTAVE FOUILLARON.

\Vitnesses:

J. ALLISON BOWEN, HENRY THIESSE.

